Andy Farrell's men will now face New Zealand in a massive quarter-final clash next weekend
O'Mahony is only the 10th Irishman to reach the milestone and joins John Hayes, Brian O’Driscoll, Ronan O’Gara, Paul O’Connell and Rory Best, as well as current internationals Cian Healy, Johnny Sexton, Conor Murray and Keith Earls on 100 caps.
He said after the game:"Hard to sum up . A very special night for me and my family, but I think the way the boys turned up for me tonight... it was a big occasion for lots of reasons.
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